可编辑的ComboBox历史记录 [英] Editable ComboBox History

问题描述

请原谅我在WPF应用程序和C＃中我是一个完整的NUB我已经完成了很多脚本，但这是我的第一个这类项目。我正在创建一个提供远程协助的简单应用程序，并且有一个框，用户可以输入主机名并单击连接，这样就可以了。我想使该主机名字段成为一个可编辑的ComboBox，它将记住即使在关闭应用程序并重新启动它之后输入的最后10个系统。我到处都看到这种类型的字段，但我不知道如何使它工作。我会包含一些我的代码，但到目前为止我没有尝试过的任何代码已接近工作。谢谢

解决方案

这是我提出的代码我决定放弃xml并使用txt文件，因为我需要存储的数据不是多维的。



.xaml

------------------------ ---------------------------

< window x： class  =   WpfApplication3.MainWindow xmlns：x =  ＃unknown >  
 xmlns =   http://schemas.microsoft.com/winfx/2006/xaml/presentation 
 xmlns：x =   http://schemas.microsoft.com/winfx/2006/xaml  
 Title =   Window1 Height =   300宽度=   300 >  
< grid> 
< stackpanel> 
< combobox x：name =   tbHostname width =   120 iseditable =  真 /> 
< button x：name =   btDisableSC content =   Test1 verticalalignment =  顶部 click =   btDisableSC_Click height =   20 grid.columnspan =   2 /> 
 < /   stackpanel  >  
 < /   grid  >  
 < /   window   >  

----------------------------- ----------------------



.cs

- -------------------------------------------------

 使用系统; 
 使用 System.IO; 
 使用 System.Collections; 
 使用 System.Collections.Generic; 
 使用 System.Data; 
 使用 System.Drawing; 
 使用 System.Linq; 
 使用 System.Text; 
 使用 System.Threading.Tasks; 
 使用 System.Windows; 
 使用 System.Windows.Controls; 
 使用 System.Windows.Data; 
 使用 System.Windows.Documents; 
 使用 System.Windows.Input; 
 使用 System.Windows.Media; 
 使用 System.Windows.Media.Imaging; 
 使用 System.Windows.Navigation; 
 使用 System.Windows.Shapes; 
 
 命名空间 WpfApplication3 
 {
  ///   <  摘要 >  
   ///   MainWindow.xaml $ b的交互逻辑$ b   ///   <  < span class =code-summarycomment> / summary  >  
   public   partial   class  MainWindow：Window 
 {
  string  strXMLDataSourceFLDR = Environment.GetEnvironmentVariable（  APPDAT ）+   \\MyApplicationFLDR; 
  string  strSourceHostsTXT = Environment.GetEnvironmentVariable（  APPDATA）+   \\ MyApplicationFLDR \\Hosts.TXT ; 
  string  strHostName; 
 ArrayList alHosts =  new  ArrayList（）; 
 
  public  MainWindow（）
 {
 funcCheckHostDataSource（）; 
 funcReadHostsFile（）; 
 InitializeComponent（）; 
 funcPopulatetbHostname（）; 
} 
 
  public   void  funcCheckHostDataSource（）
 {
  if （！Directory.Exists（strXMLDataSourceFLDR））
 {
 Directory.CreateDirectory（strXMLDataSourceFLDR）; 
} 
 
  if （！File.Exists（strSourceHostsTXT））
 {
 使用（StreamWriter objSWFile = File.CreateText（strSourceHostsTXT））
 {
 objSWFile.Close（）; 
} 
} 
} 
 
  public   void  funcReadHostsFile（）
 {
 使用（StreamReader objSRFile = File.OpenText（strSourceHostsTXT））
 {
  string  strReadLine =  ; 
  while （（strReadLine = objSRFile.ReadLine（））！=  null ）
 {
 alHosts.Add（strReadLine.ToLower（））; 
} 
 objSRFile.Close（）; 
} 
} 
 
  public   void  funcPopulatetbHostname（ ）
 {
 tbHostname.ItemsSource = alHosts; 
} 
 
  private   void  btDisableSC_Click（ object  sender，RoutedEventArgs e）
 {
  if （这 .tbHostname.Text ==  String  .Empty）
 {
 MessageBox.Show（ 请填写目标系统的主机名！）; 
} 
  else  
 {
 strHostName = tbHostname.Text.Replace（  \\， ）; 
 funcUpdateCombobox1（strHostName）; 
} 
} 
 
  public   void  funcUpdateCombobox1（  string  strNewHostName）
 {
 ArrayList alHostsNew =  new  ArrayList（）; 
 alHostsNew.Add（strNewHostName.ToLower（））; 
  foreach （ string  item  in  alHosts）
 {
  int  alHostsNewCount = alHostsNew.Count; 
  if （alHostsNewCount <  =  14 ）
 {
  if （strNewHostName！= item）
 {
 alHostsNew.Add（item）; 
} 
} 
} 
 
 使用（StreamWriter objSWFile = File.CreateText（strSourceHostsTXT））
 {
  foreach （ string  item  in  alHostsNew）
 {
 objSWFile.WriteLine（item）; 
} 
 objSWFile.Close（）; 
} 
 
 alHosts = alHostsNew; 
 tbHostname.ItemsSource = alHostsNew; 
} 
} 
} 

-------------------- -------------------------------

Please excuse me I am a total NUB when it comes to WPF applications and C# I have done a lot of scripts but this is my first project of this type. I am creating a simple application to offer remote assistance and have a box were the user can enter a hostname and click connect and that works just fine. I would like to make that hostname field an editable ComboBox that would remember the last 10 systems that were entered even after closing the application and re-launching it. I see this type of field all over the place but I am not sure how to make it work. I would have included some of my code but so far nothing I have tried has come close to working. Thanks

解决方案

Here is the code that I came up with I decided to abandon xml and use a txt file instead as the data that I needed to store was not multidimensional.

.xaml
---------------------------------------------------

<window x:class="WpfApplication3.MainWindow" xmlns:x="#unknown">
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Height="300" Width="300">
    <grid>
        <stackpanel>
            <combobox x:name="tbHostname" width="120" iseditable="True" />
            <button x:name="btDisableSC" content="  Test1 " verticalalignment="Top" click="btDisableSC_Click" height="20" grid.columnspan="2" />
        </stackpanel>
    </grid>
</window>

---------------------------------------------------

.cs
---------------------------------------------------

using System;
using System.IO;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApplication3
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        string strXMLDataSourceFLDR = Environment.GetEnvironmentVariable("APPDATA") + "\\MyApplicationFLDR";
        string strSourceHostsTXT = Environment.GetEnvironmentVariable("APPDATA") + "\\MyApplicationFLDR\\Hosts.TXT";
        string strHostName;
        ArrayList alHosts = new ArrayList();

        public MainWindow()
        {
            funcCheckHostDataSource();
            funcReadHostsFile();
            InitializeComponent();
            funcPopulatetbHostname();
        }

        public void funcCheckHostDataSource()
        {
            if (!Directory.Exists(strXMLDataSourceFLDR))
            {
                Directory.CreateDirectory(strXMLDataSourceFLDR);
            }

            if (!File.Exists(strSourceHostsTXT))
            {
                using (StreamWriter objSWFile = File.CreateText(strSourceHostsTXT))
                {
                    objSWFile.Close();
                }
            }
        }

        public void funcReadHostsFile()
        {
            using (StreamReader objSRFile = File.OpenText(strSourceHostsTXT))
            {
                string strReadLine = "";
                while ((strReadLine = objSRFile.ReadLine()) != null)
                {
                    alHosts.Add(strReadLine.ToLower());
                }
                objSRFile.Close();
            }
        }

        public void funcPopulatetbHostname()
        {
            tbHostname.ItemsSource = alHosts;
        }

        private void btDisableSC_Click(object sender, RoutedEventArgs e)
        {
            if (this.tbHostname.Text == String.Empty)
            {
                MessageBox.Show("Please fill in the Hostname of the target System!");
            }
            else
            {
                strHostName = tbHostname.Text.Replace("\\", "");
                funcUpdateCombobox1(strHostName);
            }
        } 

        public void funcUpdateCombobox1(string strNewHostName)
        {
            ArrayList alHostsNew = new ArrayList();
            alHostsNew.Add(strNewHostName.ToLower());
            foreach (string item in alHosts)
            {
                int alHostsNewCount = alHostsNew.Count;
                if (alHostsNewCount <= 14)
                {
                    if (strNewHostName != item)
                    {
                        alHostsNew.Add(item);
                    }
                }
            }

            using (StreamWriter objSWFile = File.CreateText(strSourceHostsTXT))
            {
                foreach (string item in alHostsNew)
                {
                    objSWFile.WriteLine(item);
                }
                objSWFile.Close();
            }

            alHosts = alHostsNew;
            tbHostname.ItemsSource = alHostsNew;
        }
    }
}

---------------------------------------------------

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